Modifications Forum

what i'm asking is for some pics of the mods to White's IDX or Any Classics
with the mods done. the pics should be of the inside of the control box with the
threshold and ground balance switches installed( pots ) need to the wireing
diagram any help would be great... thank ya'll very very very much..

I don't have the pics but you can find them on the web if you search for them. What I do have is all the data. you should be able to do these mods without the pics since all the VR (variable resistor) numbers are there and are easy to locate. (look for the access holes directly above them hidden under the decals. They are for making adjustments to the VRs with a small screwdriver) They are small blue components that look like little boxes with a dial in the middle of them. They are removed, wires are soldered to the three places on the PCB to each VR that runs to the potentiometers that will be doing their jobs, accessible from the outside.

Here's the instructions:
Be very carefull unsoldering the componets. Destroying

the circuit traces is very easy to do.

Remove VR1 Trimmer off the board. Replace with a 50k

linear taper, single turn potentiometer.

Remove VR4 trimmer off the board replacing it with a

100k linear taper, single turn potentiometer.

Mount these potentiometer’s externally on the top of

the case.

Replace resistor R24 with a 2.2 Meg. You could have

either a 470k or a 1.5 Meg there depending on when the

unit was manufactured.

Check resistor R7. If it’s not a 51 ohm resistor,

replace it with one of that value. It’s most likely a

100 ohm from factory. Later manufactured units had 51

ohms.

For potentiometer wiring, I use flat multi wire such as

type used in computers for component connection to the

board. I cut a 2 wire, 7.5” piece for the 50k ground

balance pot, and a 3 wire 7.5” one for the 100k

threshold pot. I secure these wires with a wire tie to

the head phone & speaker wire near the connectors. I

used one other wire tie to secure the pot wires

together up near the pots.

Caution. Be sure that the pot closest to the end of the

case doesn’t short out against the installed board

components.

S.A.T changes. R32 220k resistor can be changed out.

Raising the value slows the SAT. I have been installing

a 375k running it through a toggle switch with the

220k. Giving a high & low setting of the SAT. One could

use a potentiometer for variable results.

If your detector uses a ID meter, open the meter case,

and replace resistor R28 (3.9 meg) with a 10 meg

resistor. This aids in increasing the meter response

depth.

18 years of detecting. Bounty Hunter Tracker IV, Quik-Draw. Garrett GTI, GTA. White's 5900, 5900/DI and 6000/DI White's Classic II, III, III Plus and a Classic IDX-Pro (all with GB and Thresh mods, done myself) XLT Spectrum, Prizm V, DFX and TreasurePro, which along with a Fisher CZ5 with an inline probe from Sun-Ray and a Fisher CZ6 are my go-to machines. Hoping someday to find that "holy grail" and move up to the big boys! GL and HH!